Ok, thanks, I forgot about the Port DN status, it's been a while since I've done anything but minor programming on a MICS. I will check that out.
there is an expansion module, a 12x0, so that probably explains the DN's in the 3 range.
the thing is they have 2 lines pools already, so 8 nd 9 are used already. I know 7 is for hunt groups, but I should be able to use 5 or 6, yet that was denied as well. maybe there's a stray DN starting with those numbers I didn't see.
I'd rather not renumber extensions to 4 digits if possible. I guess if needed I can go to 2 digit line pool access codes.
Thanks again for the help.